Year	% of revenue
1996	16.746249449693522
1997	15.73720859824402
1998	16.605951815286062
1999	28.261697363766984
2000	21.80411295371723
2001	21.490678086175702
2002	19.94276408745839
2003	29.9293797512094
2004	27.5126260085716
2005	24.185582721089716
2006	29.880127056418253
2007	31.966857629125023
2008	29.34795021512845
2009	32.86379341538787
2010	31.404181687510007
2011	27.253949163785805
2012	27.063853938204623
2013	26.910037109212066
2014	25.573006196701243
2015	24.486852375062192
2016	20.279492140607566
2017	19.394857128807967
2018	25.258440013657196
2019	31.71120320401301
2020	31.401686389869297
2021	25.689143627792305
2022	29.077327506371542